I see you mostly hanging out in 4a but I thought the question I had would be more appropriate for this section. Others with low porosity hair might can benefit from your answer.

Having said that...

I thought I read in the past that you had henna'd your hair (for color). How was the absorption on your low porosity strands? Did you have to leave it in for double the amount of time recommended? How did it make your hair feel? Was it overly dry and brittle?

One of the reasons I am leery of henna is because I am protein sensitive and have to watch the amount I put in my hair and I've read that henna binds to the hair and can act and feel like a protein treatment. A moisturizing DC is always recommended afterward from what I was reading in the henna thread.

Yet and still I'm seriously considering trying it out. I put a semi permanent rinse on my hair now because I have grays I'm trying (unsuccessfully) to cover and don't want to use permanent hair color. With as quickly as the rinse goes away after application, I'm beginning to think I might as well try henna which would probably last longer and has some conditioning properties unlike the rinse.

Another thing that has me hesitating is I remember collecting a hair ball about a year ago and applying henna to it and it turned my gray hairs and orange-like color. I was happy I hadn't applied it to my actual head. I followed with indigo to darken the hair, but the grays were still a weird orange color...

In any case, might not be worth my while depending on how you answer some of these questions I've posed.

You can try doing a henndigo with 60/40 mixture for 90 minutes to 2 hours, rinse out and then do indigo for 10 minutes or so to get a dark brown color. Don't know how brown you want to get but try henndigo first and see if that gets you to the brown you want. Timing is important in a henndigo as the indigo stops working after an hour, and therefore going past will push the haircolor into the reddish or orangy shades of the henna. Some hennas also are more orange than red. I have used mehandi ancient sunrise celebration which is a darker red and has a 3.4% lawsone content for better grey coverage. Recently, I have been testing out henna sooqs morrocan henna yemeni henna to see which I like better.
I also do a baking soda wash before I henndigo. HTH

I thought I read in the past that you had henna'd your hair (for color). How was the absorption on your low porosity strands? I have left my henna on for 4-11 hours, and I never had issues with absorption. However, when I first used it, it was mostly on processed (colored hair). I still get color deposit on my virgin hair though.
Did you have to leave it in for double the amount of time recommended? No.
How did it make your hair feel? A bit dry, but it seemed to be less tangled, which it the main benefit I liked.
Was it overly dry and brittle? No.

One of the reasons I am leery of henna is because I am protein sensitive and have to watch the amount I put in my hair and I've read that henna binds to the hair and can act and feel like a protein treatment. A moisturizing DC is always recommended afterward from what I was reading in the henna thread. Yes, I always DC'ed after a henna treatment, but I also added more moisturizers to my mix like honey. I would DC for about 4 hours or overnight.

Yet and still I'm seriously considering trying it out. I put a semi permanent rinse on my hair now because I have grays I'm trying (unsuccessfully) to cover and don't want to use permanent hair color. With as quickly as the rinse goes away after application, I'm beginning to think I might as well try henna which would probably last longer and has some conditioning properties unlike the rinse.

Another thing that has me hesitating is I remember collecting a hair ball about a year ago and applying henna to it and it turned my gray hairs and orange-like color. I was happy I hadn't applied it to my actual head. I followed with indigo to darken the hair, but the grays were still a weird orange color... Henna often turns grey hair weird colors, I can't really speak on that from experience though. I haven't done a straight henna in awhile...I was mixing 50/50 with indigo (or 70 indigo - 30 henna) because I didn't want the red that bright anymore.